[PHP]swoole_server几个进程的分工

readme.md—/Users/zjh/Documents/我的文章/[PHP]swoole_server几个进程的分工

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[PHP]swoole_server进程的分工

摘要：Swoole是一个PHP语言的高性能网络通信框架，提供了PHP语言的异步多线程服务器，异步TCP/UDP网络客户端，异步MySQL，数据库连接池，AsyncTask，消息队列，毫秒定时器，异步文件读写，异步DNS查询。强大的功能，由背后若干个分工明确的进程来实现，这里详细介绍下几个进程的分工，以便入门者更快速的理解Swoole框架。

博客: http://www.cnblogs.com/jhzhu

邮箱: jhzhuustc@gmail.com

作者: 知明所以

时间: 2015-08-17

目录

[PHP]swoole_server进程的分工
目录

Swoole简介
Swoole：重新定义PHP

功能展示代码片段
TCP Server

TCP Client

主要进程分析
Master进程

Manager进程

Worker进程

Task进程

进程与事件回调的对应关系
Master进程内的回调函数

Worker进程内的回调函数

Task进程内的回调函数

Manager进程内的回调函数

Swoole简介

Swoole官网

Swoole：重新定义PHP

Swoole：PHP语言的高性能网络通信框架，提供了PHP语言的异步多线程服务器，异步TCP/UDP网络客户端，异步MySQL，数据库连接池，AsyncTask，消息队列，毫秒定时器，异步文件读写，异步DNS查询。
Swoole虽然是标准的PHP扩展，实际上与普通的扩展不同。普通的扩展只是提供一个库函数。而swoole扩展在运行后会接管PHP的控制权，进入事件循环。当IO事件发生后，swoole会自动回调指定的PHP函数。

功能展示代码片段

TCP Server

$serv = new swoole_server("127.0.0.1", 9501);
$serv->set(array(
'worker_num' => 8,   //工作进程数量
'daemonize' => true, //是否作为守护进程
));
$serv->on('connect', function ($serv, $fd){
echo "Client:Connect.\n";
});
$serv->on('receive', function ($serv, $fd, $from_id, $data) {
$serv->send($fd, 'Swoole: '.$data);
$serv->close($fd);
});
$serv->on('close', function ($serv, $fd) {
echo "Client: Close.\n";
});
$serv->start();

TCP Client

$client = new swoole_client(SWOOLE_SOCK_TCP, SWOOLE_SOCK_ASYNC);
//设置事件回调函数
$client->on("connect", function($cli) {
$cli->send("hello world\n");
});
$client->on("receive", function($cli, $data){
echo "Received: ".$data."\n";
});
$client->on("error", function($cli){
echo "Connect failed\n";
});
$client->on("close", function($cli){
echo "Connection close\n";
});
//发起网络连接
$client->connect('127.0.0.1', 9501, 0.5);

更多代码片段请见swoole官网。

主要进程分析

Master进程

Master进程主要用来保证Swoole框架机制的运行。它会创建几个功能性的线程：

Reactor线程:就是真正处理TCP连接，收发数据的线程。swoole的主线程在Accept新的连接后，会将这个连接分配给一个固定的Reactor线程，并由这个线程负责监听此socket。在socket可读时读取数据，并进行协议解析，将请求投递到Worker进程。在socket可写时将数据发送给TCP客户端。

Master线程(主线程）: 负责：Accept新的连接、UNIX PROXI信号处理、定时器任务。

心跳包检测线程：（略）

UDP收包线程：（略）

Manager进程

swoole中Worker/Task进程都是由Manager进程Fork并管理的。

子进程结束运行时，manager进程负责回收此子进程，避免成为僵尸进程。并创建新的子进程

服务器关闭时，manager进程将发送信号给所有子进程，通知子进程关闭服务

服务器reload时，manager进程会逐个关闭/重启子进程

Worker进程

接受由Reactor线程投递的请求数据包，并执行PHP回调函数处理数据

生成响应数据并发给Reactor线程，由Reactor线程发送给TCP客户端

可以是异步非阻塞模式，也可以是同步阻塞模式

Worker以多进程的方式运行

Task进程

接受由Worker进程通过swoole_server->task/taskwait方法投递的任务

处理任务，并将结果数据返回给Worker进程

完全是同步阻塞模式

Task以多进程的方式运行

Task进程的全称是task_worker进程，是一种特殊的worker进程。所以

onWorkerStart

在task进程中也会被调用。当

$worker_id >= $serv->setting['worker_num']

时表示这个进程是task_worker，否则，代表此进程是worker进程。

进程与事件回调的对应关系

Master进程内的回调函数

onStart
onShutdown
onMasterConnect
onMasterClose
onTimer

Worker进程内的回调函数

onWorkerStart
onWorkerStop
onConnect
onClose
onReceive
onTimer
onFinish

Task进程内的回调函数

onTask
onWorkerStart

Manager进程内的回调函数

onManagerStart
onManagerStop